I've debated on whether to give my 2 cents......which is probably worth less than that........
1) A hand gesture? I wouldn't get too wound up about it. Happens all the time. If it goes to the next level, that's when its bad......
2) I've been at tracks like Pocono and Watkins Glen (power tracks) where I have been fighting for first or second....... and fighting for a championship..... and gotten mixed in with the second tier of ITS/ITR cars. It is MADDENING!! As time went on, the pass attempts got riskier and riskier..... some guys were clueless, one guy knew it but when approached nicely after, his comment was that he was worried about losing his 6th position.......... Seriously, if I'm glued to your ass at a power track, you need to get out of the way or take up stamp collecting......
I know this is going to be an unpopular opinion with some.......... but it is what it is......
On edit: I did watch bits and pieces of Rob's video but missed the incident with Drew so this isn't a comment on THAT specific incident.