IN Glasgow parlance it is known as getting a good kick up the bahookie.

This rite of passage tends to happen when you think you're cock of the walk only to find out that, in fact, everyone sees you only as a feather duster.

It's actually okay to take a sore one from time to time, as long as you learn from the mistake which allowed someone of some thing to bring you down a peg or three.

Rangers received one such painful reminder on Friday night. It might turn out to be a good thing but only if the lessons staring them in the face are not ignored.

They are no feather duster, but neither are they flawless and there was more than one supporter who took to social media to comment that the 3-2 defeat might not have been the worst result in terms of the long-term. They had a point.

If there were some who did think that all was more than well and that their's was a side ready for just about anything, along came Falkirk to score three goals in 18 minutes, which put Mark Warburton into a bad mood after a defeat that seemed so unlikely for much of the night.

The Championship title is still heading to Ibrox. The only thing to change is that it might take a week or so longer before matters are settled and it is Falkirk, not Hibernian, who now look as if they will finish in second place.

But if Warburton is smart, and we can safely assume that he is, then Friday evening will serve as a timely reminder that his team has some flaws, which will need to be ironed out for next season.

There are some Rangers supporters want to see their team challenge at the top of the Premiership next season. It is highly unlikely that will happen.

What should occur is that Warburton assembles a squad good enough to finish top four at worst - he does have far more money than most other competitors after all - and then the club takes it from there.

Dave King loves a soundbite and the next one to come from him should be one of caution and realism, which does not come naturally to the owner.

It is not unambitious for King or anyone else at Ibrox to suggest that it might be asking a tad too much for them to compete with Celtic after four seasons playing against painter and decorators.

Who knows how Barrie McKay, for example, will handle better full-backs? Will Kenny Miller be able to keep going is another question which will only be answered in August.

What the Rangers supporters and their manager do know is that quite a few of their players will easily cope with a step-up, and more on the best of them in a moment, but there are doubts and frailties - Friday and Falkirk proved that.

Rangers need to sort out the defence. No matter how dominant they are in any match, chances are always coughed up to the opposition.

You get away with that in the Championship. They won't next season, or at least not to the same extent.

Warburton admitted that his players were finding their last game too easy having gone 2-0 by playing genuinely good football. Lee Wallace conceded that complacency was an issue.

This has to be sorted out by the coaching staff.

Rangers are good going forward and not so good when asked to defend, which they will have to do a lot more of next term.

If Warburton and is team are going to do more than merely make up the numbers in the Premiership then they need sharpen and tighten up at the back.

Oh, and one more thing. James Tavernier is a talent and there is nothing wrong with a full-back willing to get forward.

Indeed, there is a stand at Ibrox named after the great and much missed Sandy Jardine who was known to get himself up in attack from defence every so often.

The legend always knew how to defend and Tavernier, who had a bad night at Falkirk, has to be more mindful of his primary job because he does get caught out.

These are not insurmountable problems and despite the defeat, Rangers have plenty to be happy about.

One of them is Lee Wallace.

The captain was outstanding against Falkirk but then he always is. Wallace is a machine and has been superb for Rangers throughout his time at the club.

He leads by example on the pitch and conducts himself well off it. Rangers would do well to find a few more like him.

John Brown was someone who fitted that role of the dependable rock during his days as a player and recently admitted that his beloved club might have to take a few sores ones on the way back to the top.

Losing to Falkirk was more frustrating than anything else, but what Warburton must do to avoid too many more kicks is bring in a few more defensive minded players because the managers he will face next season will have noticed his team's weaknesses.

Ronny Deila, who watched Friday's game, will certainly have noted where Celtic can hurt Rangers next month.