I'm a little more like you, I guess. Sometimes I will seek someone out but if I get killed trying to exact my revenge more than twice I will just leave it.
Knifing is a bit embarrassing, yeah. I never even used to notice half the time in BF2 but you can't help but notice when it happens in BF3. Sometimes it makes me laugh when it happens; it can be a bit of a shock! Other times it's annoying.
If someone repeatedly gets me, regardless of what weapon was used, I will keep them in mind and often abandon my objective just to get them. This is especially so if they're camping/sniping from a well protected place and other people are falling foul to their ambush.
I really don't make too much out of being knifed as I think it's a bit silly anyway: the whole animation thing is overblown and unless you actually have a knife in the heart/slit throat then it's just daft it does so much damage compared to high powered bullets/rpgs and the like. I actually still prefer the knives from BF1942!