This is silly. The so-called "gas chambers" were delousing showers. Lice are known to carry typhoid fever, which is a huge problem in war and was a huge problem during the Second World War. This is why they had the prisoners remove their clothes and why they had their hair cut. After all, why would the Nazis bother doing that if they were just going to kill and bury/cremate them anyway?
And here's the kicker: If Auschwitz was really a "death camp", then why did the Nazis bother moving Anne Frank and her sister to Bergen-Belsen, which was one of the normal concentration camps according to holocaust lore and where they died of typhus?
Always hear everyone's position, no matter how "evil" you may believe them to be. And don't get emotional, either. Be logical and reasonable in all things. Do not mock them or scoff at even ridiculous claims, for truth is stranger than fiction, and it is always possible that you are wrong.