> Side note: How do I know if someone downvotes my comments? On Reddit it's easy as you can see the score, but here? Am I missing something?

Here, you can see the score on your comments when you are logged in (your comments have a red asterisk and the point score before your name, others comments don't have either feature.) Additionally, if the net moderation is negative (net score is 0 or less, since score starts at 1) for any comment (yours or not) the comment will be greyed (moreso the more negative the moderation is.)