How should one approach unknown fish short stackers 70bb or less eff stack?

I don't have any database to review , but I usually give them a high chance of being a passive nitty player 80% , and maybe a whale 10% , and player capable of spewing/bluffing 10%. I think most aggro/spewy players tend to want to play with a bigger stack. So I tend to overfold a lot vs them . Is this logic correct?