Posters specifically offering their reasoning aside, people often use arbitrary criteria to reinforce their choices when there is so much to choose from. What does someone, who, say, only plays half a dozen big AAA games a year, (let's say a mix of action games, shooters, open world and RPGs as they make up a large chunk of that sector) really lose by saying 'I don't play indies'? Probably about as much as saying 'I don't play sports/racing' (a huge sector easily dismissed by many gamers for several reasons) or 'I don't play mobile games'. It's not that they automatically don't like indies, it's that most gamers only get to play a fraction of a single percent of the sheer number of games released in a given year.
I mean, I don't really play many AAA games, it's not on principle, it's more that, of the few new games I'll play, the genres I like exist elsewhere. A shitload of great AAA games released this year, and if I played 30 games rather than 10, I'd probably get around to some of them. The visable end result is the same, my friends think I don't like western AAA stuff, when that isn't true, they just aren't my priority. It's an easy assumption to make though.