I would be inclined to agree with their stance, but really with some of the posts created by whom this references, it's veering into a 'Reap what you sow' situation. Most employees aren't doing to insinuate the same things that were insinuated in certain tweets.
I don't condone it by any stretch of the imagination, but if you create inflammatory remarks then people are sure to follow with an inflammatory response.
and yes, I am referring to that specific tweet on the 'Smile' OST.
As for the more serious avenues of harassment, like threats and the such... Yeah, that's unhinged and unwarranted in any capacity.