I wouldn't be surprised if he does it when he gets himself into one of his paranoid phases and thinks random people posting on his accounts are out to get him. I mean he isn't exactly wrong about that but he doesn't realize that cause he's an idiot. I also wouldn't be surprised if its literally the voices on the wind telling him which ones to block
For all his bluster and rage lucas is extremely paranoid, even if he frequently tries to hide it. Just look at how he acts in his videos, with his eyes darting around constantly and making a point to avoid people while making them. He did the same thing when he filmed himself walking around the shelter and visibly had to keep himself from scurrying off into a corner whenever someone told him to shut the fuck up
That said, a large part of his paranoia is likely caused by him knowing that others know about him enough to know hes a creep and he is constantly afraid of being called out for it in public. That paranoia is heightened by his mental problems to the point he assumes practically everyone is out to get him or secret kiwis, or in league with the greybeards or starbucks and such at times. The fact that he is extremely narcissistic doesn't help either, as he believes he is someone who is important enough to be noticed like that. After all he is some super genius that all the greybeards on post street ripped off so they could get the zoomer baes right