Yes, I was also blocked and insulted sometimes on social networks.
It is indeed disrespectful to block and insult other users, simply for not saying "yes and amen" to everything (including nonsense) they "should" - as "true friends" - agree with at 100 %.
You can find angry, exasperated, sickened, distressed, lonesome, bored, fanatic, hateful or abusive and even pervert(ed) users, including trolls and crooks on any site.
And remember with a smile that "nobody is perfect":
Furthermore, private and professional users have to deal with messages and mails proposing lottery winnings, inheritances of or management mandates for big fortunes, highly paid fake jobs, aggressive advertisement, etc., and also sex or porn proposals and pictures, etc.