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I always check their other comments before I flag. The obvious ones have the exact same spam comment multiple times on the same post!

I dislike flagging but it is getting a bit much and, it's a tool in our toolbox designed for dealing with this exact issue, so I feel a little less guilty now when I flag someone's comment.

I've yet to flag but I've come pretty close on occasion for some obvious trolling. For this kind of thing I'm tolerant but I don't upvote if I think it is not worthwhile.

Please flag bots, especially if you can lower their rewards

I agree, however it's difficult to believe a user won't upvote after commenting "That's amazing", "You are an incredible photographer" and "I've never seen something so cool."

You get my point :)

Yup, it happens like that sometimes.