Over-reaction on your part, imho.
Let's face it, lots of people on forums/messageboards are on there as many different incarnations and of many personalities.
There are also trolls who delight in winding others up, there might be future axe-murderers busily grinding their weapon, or they may be 57 years old and still living with their mothers, while fantasising about their 19 year old next door neighbour, but still wearing a fair-isle pullover, attending to their comb-over, and wishing they mattered to someone
other than their Mam. Writing on the net, having others read their ill-thought vitriolic jibes gives them power.
You react, you feed it.
Don't even worry about it. Or post that you are too off your face on steroids to post right now