Using /support just shows a general inability to actually produce a legitimate sentence that could have an impact on the person that is being supported. Sloth and imbecility are the roots of these one-word posts.
People are lazy. What are you going to do? Force them to post a full on sentence explaining in detail why they agree?
Plus, sometimes agreeing would be common sense so people just say common things like /support or "I agree"
Pretty tired of people getting pissed at this, it's not going to change anything guys, sorry.
People are going to be lazy, just like people are going to have bad grammar.