I always applaud when I land and I sit at the front.
I do only if it's a greaser. And being a F/O, where the captain's landing, no matter how hard it was!
It always used to amuse me as to why they didn't at least wait until we'd slowed down and turned off the runway before clapping. I had this vision of 180 happy pax clapping as we ran off the end of the runway!
You just reminded me of my mum who always feels relieved when the gear is barely on the ground. I've told her "not yet, you still have to slow down, you know?"
I recall a stand-up comedian who disliked when people clapped when they landed and said: "We were supposed to land!!! So, what? Do you boo if we crash into a cornfield???!!!"
It's not a LCC thing though, I've seen it on legacy carriers as well, albeit when it's a holiday destination we are landing at or there was nasty weather while approaching