Uh...yes? How does that relate to them feeling entitled to impose on others because they decided to make a waking petri dish?
And they do the same shit in business/first. With most narrow-body configs being 2-2 and fewer seats available it's harder to get three in a row on short notice. They always want my aisle seat across from the 2 they got together. I almost always tell them to fuck off. I don't want to be back by the restrooms, or up by the galley, and I definitely don't want a window seat. If they want to trade for another aisle seat one row back or forward and I'm alone, maybe I'll do it, but I booked what I wanted and I don't understand how they have the gall to impose on a stranger like that. And I'm usually sitting next to my wife, but do you think that stops them? Fuck no, they will look you in the face and with no sense of irony say "do you really have to sit next to her?" Sometimes they're doing it to multiple people because their seats are scattered all over. You run into that more on wide-bodies because the seats aren't really next to each other often, many times they're kind of off-set a bit to fit the lay-flats in and if you don't understand the seating chart you might not be as close as you think. But I do understand the seating chart and I am as close to being next to my wife as I can get and don't want to move. It's even worse when they do it to people back in coach if they're trying to stick them with a center seat. I haven't been in that situation in many years but that would be an even harder no.