Can あなた give me advice?

Do NOT just let this slide. Never let things like that slide.
あなた can either address them with the problem in the calmest and most mature manner possible, または あなた can simply stop being フレンズ with them. If あなた ask me, あなた should try to address them to at least do as much about their perspective on it as possible, just to see both sides of the story in a balanced manner before making any definite decisions. Find out why, and find out if the problem can be resolved for future situations. However, I don't know the story in full, so I can't tell あなた what is exactly best to do and the real choice is up to you.
However! Do not lash out in a violent または disrespectful manner as it will only escalate the problem and it may get あなた in trouble as well.

Gah, sorry for the soap box... In a nut shell, I strongly suggest that あなた approach it in the most mature and reasonable manner possible and in the extents that あなた find most necessary. Evaluate and see if the problem can be and is worth fixing, and use your best judgement to make decisions afterward.

Leave them and don't make any contact with them whatsoever, there not your friends, there just douchebags that want to push your buttons so they'll think you'll go over the limit.

Tell them they're shallow fake assholes who deserve the ultimate punishment of spending the rest of their lives listening to nothing but Taylor Swift~

Dump em! Kick em to the curb! Break their itty bitty hearts! Say it however あなた want. フレンズ are supposed to make あなた happy not sad!

I say ditch them at a コンサート and 移動する to london
if あなた live in london, Your in good hands -thumbs up-

well if theyre just "friends" (i assume that the quotation marks mean theyre not very good フレンズ to you)then あなた should get rid of them. point being "friends" with people who write あなた mean notes and call あなた an idiot.

"Dump" them, if they can't be nice they don't deserve your friendship.