Try and let it roll off. Sounds like you've been a big person about it.
There seems to be a lot of sniping go on on this site lately almost to the point that I debated whether I really wanted to keep coming back. (Clearly I made the right choice.

)
I haven't been on much the past few weeks for a variety of other reasons and I've missed it a lot! So definitely don't sweat the small stuff!