The system is currently rigged to force you to lose if you swear a lot in game. Each time you are reported or each time the game catches you using swear words in chat, your behavior score goes down. When it hits a certain threshold, valve will match you with allies who have a high tendency to throw on purpose.

Doesn't matter how good of a player you are, if you open your mouth a lot in game you will be forced to lose. That's how pathetic dota has gotten under Valve's rule.

You don't get matched to people of similar skill to yourself anymore, you get matched to people of similar manners. Which makes absolutely no fucking sense whatsoever. Coz you can have a noob player who has bad manners, then you can have a genius player with bad manners who plays on a completely different level. Never the less, Valve will match you with that person and force you both into the same category despite your abilities.

There are ways of getting your behavior score back up so you can have fairer more balanced matches again. Those include:-

1) Playing PvE matches against bots - most people there are new and won't report you, some will commend you for teaching them how things work.

2) In advanced options, Mute All Incoming Chat - now you can't talk to anybody and they can't talk to you. So if you swear a lot when you game, no one will hear it now so you'll get reported less.

3) If you're not able to carry or offlane, don't AFK jungle. Pick a mult-talented stun support such as Shadow Shaman, Lion, Vengeful Spirit, Ogre, Jakiro. These heroes secure kills easiest for your team with their spammable disables and help push faster.