If it is over a kiss on a cheek, then Hogmanay down south must be a riot!
Under s3(b) it would have to be 'sexual' and I'm sure it's arguable that the context was consoling. It's a key hurdle because any touch between people whatsoever is covered by s3(a).
(I believe in Scotland the same test is "intentionally or recklessly touches B sexually")
It's all based on a few tweets though, presumably there's another side to the story we've yet to hear. If for example you were on a train trying to chat someone up, telling them they're lovely, and then kissed them on the cheek, the context is very different.
It sounds like the very lowest end of the spectrum, but we'll see.