Problem is the moronification of F1 in recent years. Masses of typical football (soccer) fans have started watching F1 for reason unknown to me. You know, people who are turned on by fast and furious philosophy of "racing", 20 year olds who can't replace wheel on their neon lightened cars "tuned" by KN filter and 7000W subwoofers.
They cheer for teams and drivers based on which car they have or the driver's nationality. That goes even lower, like "Kimi got drunk, haha, I got drunk frequently too so I cheer for Kimi". Or, "DC shagged some actress so since I'm turned on her I cheer for DC and RB". "Or, I smoke Marlboro so I cheer for Ferrari."
Wide spread of betting on F1 in recent years also moved football fans closer to F1 since they started betting on F1 too and following it because of betting and only trough betting.
Knowing what is the average football fanatic mental profile it isn't surprising to hear that such people come on F1 circuits and insult sportsman just as they do it on football stadiums.
F1 always had some class and dignity but now it's become big business more than anything and any kind of fans are welcomed as long as they don't bring they own beer and stick behind the fence. Sell, sell, sell and they buy, buy, buy so they became acceptable to F1 industry which cares for nothing but TV ratings and profit.