Well that depends on what mode your in. All 3 FL modes have a mechanic baked into them for earning a majority of the points that contribute to victory. Kills are a secondary factor. You can actually win without killing anybody in all three FL modes, but kills can still contribute to an overall victory faster since each kill does add points to your team and SUBTRACT points from the team of the player that was killed.
Being good at FL requires personal knowledge of the class you are playing as, effective teamwork, and situational awareness. That last one is a big one encompassing things like... don't chase, don't run off on your own, don't approach a ice/nodes by yourself if 3 or more opponents are already hitting it... I've seen so many tanks get killed at ice after running in solo. Final report comes in with them contributing like 3 points from the ice... which is completely negated by the negative points they lost their team from their death.
Some deaths are bound to happen, but each one should make you reevaluate the situation. Does your party not have a healer, or is the healer you do have subpar? Then maybe you shouldn't be taking point and instead be hanging back with the DPS and using draw-in to pull opponents into the pack to be slaughtered.
Even in the scenario you have presented in the OP, how did you get yourself in a situation where an opponent could SAFELY spam an emote on you for 25 seconds without any fear of retaliation? That means you were either alone in the first place, or your team got overwhelmed somehow. So learn to evaluate match-ups from a distance. Is the incoming enemy squad larger than yours, or do they have a healer with them when you don't? Perhaps a strategic retreat is in order...
That isn't always going to be the case, for "king of the hill" type nodes as it might be better to stand your ground and take a death if it means you get to hold the node longer. If you can stretch the engagement out to where your team earns more points from the node even after factoring out the subtracted points from your death, well that's still a net gain for your team then. Also part of situational awareness... and again, if the final result is that your team won then in actuality that was 25 seconds WASTED by the player spamming the emote when they could have been doing something else to help contribute to their teams victory.