I like the idea of this concept, the pouring of a hot kettle acts as someone talking nasty or mean or annoying.
First line maybe try "on me" instead of "in me". Otherwise I think this poem could turn into torture because who would want a steaming hot kettle of water poured down their throught. People don't pour words down other people's throughts, do they? Unless the speaker is the cup?
I like lines 2 and 3, although I'm not sure of the word "tingles" in line 3. Tingles doesn't suggest pain, or annoyance. To me its a neutral feeling. Unless you're are trying to suggest numbness like when your foot falls asleep it gets all tingley.
Lines 5 and 6 don't make sense to me.
Again, concept is good but I think needs some work.