Claims that lightning or coinjoin privacy is comparable or even superior to Monero. This requires a longer thesis that gets into the weeds of chain analysis and network level privacy, but is a laughable claim. I'll link a previous note of mine if you're interested. 

Claims that Bitcoin is more useful when usage stats show that the free market finds Monero more useful by... using it more often. I just wrote a note about this. I'll link if you're interested. 

Claims that Monero is somehow at higher risk, or even guaranteed risk, of an inflation bug by utilizing Petersen commitment and Bulletproofs++ ZK proofs to hide transaction amounts. The risk is binary, either the math is sound or it isn't. Simple addition is no more sound than the most fringe Mathematics insofar as the mathematical proof is sound. That's how math works, it has guarantees of certainty because it functions outside of material physics. Also, just like Bitcoin, supply is verified by every node on a per transaction basis. 

The claim that Monero's tail emission means "unlimited inflation". No its got a limit, 0.6XMR per block which is about 0.6% supply increase per year with today's supply, slowly reaching 0%. This ensures perpetual mining rewards ensuring low fees and security at the cost of a supply increase rate almost 3 times less than gold. Bitcoin has had a tail emission proposed many times as a means to avoid the fee economy security crisis it gets closer to each halving, but no dice. This also is ignoring lost keys which make the total supply likely deflationary. 

That's the most of it, I'll let you know if I come across or think of another.