Depends on context and the situation I guess. If you do it 3 times, not so much, but if your constantly spamming it the entire time or after killing someone then it could be considered griefing. Depends on the person really.
It's not a cause for report and it's not an offense. If someone gets triggered by ''Sorry!'', no matter how many times written, then that's their problem.
I'm entirely guilty of throwing out 3 'group ups' at a time... ESPECIALLY when theres that team mate hunting minions when you're breaking, another completely AWOL and the third seemingly hasn't moved from the spawn point. GG