Same, that and “not defending OE at the bases’ ramps”.
Even just today, I had an A1000 leave TotP because I clearly all 3 bonuses before 1st Thrasher spawned.
I don’t get these people at all. It seems their enjoyment is doing the mission, but it seems only enough that they don’t have to do all the work (if not barely any work) and their ally do most of it. To me, if that’s how you enjoy it then play on casual… it is literally designed to have less things and slower pace. No judgment.
Instead, they join in Brutal, done 0 or next to no-work. Then complain or rage quit (often with colorful messages like the above, and that’s a benign hilarious one at that) because you’ve done all the work.