What's going on with these hyper-aggressive players

So I am on lichess in the 700es range and I continue to have these players as opponents who early on attack really aggressively.They must have some success with this (element of surprise I guess), but if I look at the stockfish analysis there moves arent so smart. (difficult enough for me to fend off though). I sometimes feel a little dumb, though because it can be quite hard to find out how to stop their attacks..