But it's not semantics. When people dilute the meaning of words, they undermine their own ability to communicate. They even harm other people's ability to be understood. Doesn't it strike you as dissonant when someone posts something which is truly and unambiguously an example of love or hate, and then the very next post is almost cruelly casual in comparison?
Admittedly I have, myself, abused the Love thread in this way, although I've been very disciplined about the Hate thread. I started the Amusement thread to try and divert some of the non-love stuff away from the Love thread, but I guess more threads are needed.
Or, to take it the other way, we might simply lump everything together into a single "What's on Your Mind?" thread, avoiding the problem of word dilution.