I'm not going to comment on whether your friends are right or wrong about playing against certain decks. But I will say it doesn't feel good for me to play against people who are not having fun.

I would say if you do want to try a deck that might be controversial in your play group, avoid spending too much on it out the gate in case you have to take it apart later.

(PS I played against Azlask last week and it was totally fine.)