SE should never have implement squat emote

[Rowde]

So sexual harassment is considered petty, got it

You can't apply "real world" logic to every scenario. A major part of competitive modes has always been Psychological Warfare.

As others have already pointed out, disrespecting your opponent is often utilized as a tool in these modes. An agitated opponent is more likely to make further mistakes that can be exploited for more kills that will contribute to a win.

I mean, look at it from this perspective, that's 25 seconds in which they weren't doing anything that actually contributed to earning points for their team. That time investment only pays off if it throws you off your game and causes you to make further mistakes. If you laugh it off, recompose and focus on contributing to your team's win then their gesture has no meaning whatsoever.