How to get easy rank ups.

Step 1.
Collect "-rep hacker" comments on your profile.

Step 2.
Go to matchmaking

Step 3.
Enemy will call you hacker after first round or even before the match starts if you're lucky.

Step 4.
After the "omg hacker" call from enemy team, there is usually aim, trigger or rage toggle at this point.

Step 5.
Report enemy for hacking and wait for them to get vac/overwatch banned.