there are people that are not nice.. but come on.. thats life
i agree, but on the interwebs, its much worse, due to the false bravado and courage created by the anonimity and safety of being behind a computer screen
for instance, in sports (like the ones you play with a ball in the sun) there is also smack talk. difference is, its not as sophisticated (its more, heat of the moment, right off the top of your head simple arguements, as opposed to multiple stage, backed up, 30 minute planned responses) often less scathing, and the best bit, you can smack them back if they talk smack to you. i play contact sports, trust me i know.
and i know from that perspective, that it can get quite infuriating when you lost fair and square, logically, inevitably, and fairly, and some prick comes on and screams at you for 15-20 minutes about how much of a noob you are and how you got pwned and how your mother didnt seem to mind the night before...
with people like that, who attack for the sake of attacking, not for some cause, its impossible to retort, and yes, it gets to some people more than others.
i can understand someone working all week, being tired and needing to wind down, wanted to go on the computer and play a relaxing game of Sins, only to be wound up again by some little prick... or some big prick, you can never tell...
the fact remains, unless you are in a good mood and can put up with smack talkers, or know who you are playing with (i.e. you play with friends) and can relax with the knowledge that no one is going to be overly abrasive, then sure, MP is great.
however, there is always the group of shitheads who will be trolls and ruin it for everyone, the trick is finding out who they are and avoiding them...
Slightly more on topic, getting beaten by a "pro" player isnt an issue, if they are conscientious, can laugh good-naturedly, and proceed to explain why he won, not start screaming and jeering about the fact he 'pwned a noob'. That, i think, is the main issue.
Note: when i talk about people talking smack and being insulting etc. im not talking about people who destroy your fleet and go, oh man, your fleet just got wasted, haha, that sucks. thats normal competitive interaction. like cheering for your favorite team. i mean the people who insult you personally, who scream and yell when they destroy a starbase or destroy a fleet with another 3 times the size of the one they destroyed. or even those who start being incredibly insulting when they lose (although, seeing as you won, those are easier to ignore).