If you want to play it safe short sleeved shirt or rolled up sleeves and just make sure your arm is touching the case while you put it in.
That or put it in with one hand while you hold the side of the case
These days I don't even bother, except maybe unless I'm building a big server and I don't want the headache of having to report the RAM DOA when it's meant to be installed the next week.
Never argue with idiots
They bring you down to their level and then beat you with experience