When friends start to resemble old bras

i couldnt help but make this analogy when a very good freind of mine began to really get on my nerves. u see, I dont have any major problems with this girl, but sumtimes, well, most of the time actually, she has this irritating habit of saying things and commenting on things that you'd rather not receive a comment about.

An example of such a time: (yes, i know, the problems always have to be about the opposite sex, even if they are not romantically linked in the slightest)

anyway, i have this part-time friend( male, who will be referred to as Loner) and i say part-time, cos we can be the best of buddies for two months and meet up for coffee and do a movie, and then we go through a drought, where we dont call/see each other for months on end and then the cycle repeats itself...
This relationship suits us both quite fine, except he is not sumone to call, in case of an emergency since he may not answer his phone..
Nontheless, i still regard him as someone of relative importance in my life (might have something to do with him looking like the Bollywood actor Shah Rukh Khan)

And this is where my friend comes in.. even though she doesnt know this guy in person, she thinks that he is an idiot(for reasons of her own i guess) but she never hesitates to voice her opinion over him, and anything else that she wants to bitch about even if i dont want to hear it...

now, i met up with Loner last week while i was shopping and we got chatting, and thats when my friend phoned. When she heard whom i was with, she didnt spare me her thoughts on the guy in question... and thats when i got the analogy of the bra and im sure that girls could relate to this:
just as an underwire bra becomes old and uncomfortable at some stage, no matter how much u liked it before, U just have to get rid of it eventually... In the same way, some friendships reach a stage, when you are forced to evaluate the friendship, and by weighing the good and the bad in it, decide whether to replace the underwire or to just throw the whole thing out with the rest of the garbage....