I have a theory, that some coins influence BTC price negatively,
In the past i felt that once XRP goes BULL, it stops BTC BULL
and now, i see once XRP was dumped after the airdrop, BTC went bull again
This is most likely what happens after the airdrop. People hold their XRP until the snapshot airdrop occurred and sells, and it is pretty expected that they would sell after the airdrop. I think that it is a coincidence that BTC went up and XRP goes down. Most of the bitcoin/altcoins
pair react the same thing when bitcoin goes up.