I don’t block super quickly unless they’re obvious spam, bot, or troll with bad intentions. I am very quick to apply user tags my Lemmy client supports so that I can flag them for future reference. I use yellow to mean they’re sus, consider their intent and recent history before engaging. I use red to mean “do not engage” just sit back and watch other people fall into the trap. I use Green for interesting people to pay attention to when they post or comment, like the dude/ette we have on Lemmy who is actively working on the Roku client for Jellyfin.