Gee, I wonder why Verstappen, Red Bull, and Horner most of all would receive boos...

That said, I don't see why the FIA feels the need to wade in on this? There's not a lot they can do if fans decide they don't like something. What are they gonna do, fine the fans now too?

The FIA should get back to governing motorsport, not trying to insert themselves into any and every drama. I feel they only give a shit about the booing because they themselves also got booed.

You have essentially a team sport (yes, there's also the individual component), of course fans are going to be "tribalistic" about their teams. And as any sports fan knows, the team that's been dominant for a long period of time tends to be polarising, you're either with them or against them (especially when that period of dominance started with controversy).

Doesn't mean it's a good look for boos at a formal function as opposed to race day, but can't say this is a surprise.