No, I get why he's mad. But that fact remains Favre probably wasn't avoiding a tackle even if he avoided the initial run. Favre was never as nimble as the latest generation of quarterbacks (like Mahomes), so the best he could hope for his throwing the ball aways and taking the hit. The way I see it. Gastineau is angry because Brett Favre, a man with a history of concussions and the erratic behavior to show for it, didn't take a punishing tackle so that Strahan could "earn" the accolades he feels were being taken from him.
Bad as that sounds, I get it: a lot of money is out there for former players who punish their bodies to the extreme and there is no question that Strahan has used his record to get into the Hall of Fame while Gastineau isn't. Worse, he's suffering from Parkinson's and Alzheimers apparently. The game encouraged him to destroy himself so that the could get fame and accolades, and another player chose to avoid the physical punishment and award with an asterisk the record to another less deserving player. When he says "you hurt me," to Favre, that is what he means.
It's still misdirected. Favre didn't conspire to have his friend win a record. He gave himself too easily so that he didn't shorten his life another 10 years. Gastineau should maybe be angry at the Jets for not taking better care of him. He should be angry at the NFL for allowing the sport to be violent. Maybe he should be angry at Strahan for not acknowledging him more. But it doesn't help getting angry at an aging quarterback who chose to take care of himself rather than give value to a useless record.