Another well known failtroll tactic, whenever said troll's behavior, mannerisms or other means of trait are questioned he/she will always bring up a defence blaiming it on their own mental disability rather than try to fix it - they do it apparently because it makes their so called victims "RAEG".
I don't buy the schmegegge about Morty sleeping with Moira.
His version of the story was pure schmegegge.
The whole schmegegge was made up to get Liz a little bit of attention.