Interesting Dispel Magic Questions

[RSP]

Interesting, but not exactly rules official:

“Nov 15, 2016
@JeremyECrawford If I Dispel Magic one of many creations from a 'Conjure ???' Spell, does the entire spell end, or just that one creature?
2:15 PM · Nov 15, 2016

Jeremy Crawford
@JeremyECrawford
If you cast dispel magic on a creature, the spell affects only that creature. If you cast it on an object, it affects only that object. #DnD”

So JC seems to answer the RAI for this, though, again, grain of salt on the tweet.

If you have to maintain Concentration on a spell, a Dispel targeting you can end the spell.
That’s one ruling I'd stand by.

I’ve always thought it generally accepted that you cannot dispel Concentration, and in line with the above tweet, back from when tweets were “official” (I think: 2016 seems to be when that was the case).

Also wouldn’t that then mean if you target another creature with Haste, the spell is also on you? Would both creatures (caster and target) lose the ability to act on their subsequent turns when dispelled?