Parity issue has nothing to do with ethereum. Parity is third party multi-signature wallet provider. If they have problem they should solve it. Ethereum price has been rising if you notice since parity issue.
But if you think about it, it should effect ethereum because it was stoled money from Ethereum, those 30 million dollars did not came from the air, they were part of the whole marketcap of Ethereum, it has not been money who suddenly appeared on those wallets.
And yes, it did not affect bitcoin because ethereum was suffering a huge hyping during those days, and this is why that kind of issues did not affect it, because they were covered and maybe 1/3 of the people were not aware of that.