The term boomer is quite commonly used to refer to people of any age that conform to 'boomer' stereotypes, such as not being being very technologically literate (do a live stream with your microphone muted the first 2 minutes, and don't be surprised if you're called a boomer even if you're 30).
I think it doesn't even need to conform to a stereotype but is often used as a simple ad hominem aimed at anyone assumed to be older. It's not really new, in the same way that the amusingly-quaint sounding "get back to Squaresville, daddio" wasn't new either, but it's much the same sort of thing.
As for steak, I do have a rather narrow view that anything more or less than rare is Just Wrong™ and I like pineapple on pizza... inasmuch as I love pizza until I have a carb overdose about 15 minutes later!
