Why would a guy be angry at me for not liking him smoking pot (he said he wanted to be honest and see if I would be okay with it)?

When it turned out I wasn't okay with it he got angry and 'felt judged'.

I literally didn't say anything mean, just asked him how often - and he got really defensive.

Why would a guy be angry at me for not liking him smoking pot (he said he wanted to be honest and see if I would be okay with it)?
Why would a guy be angry at me for not liking him smoking pot (he said he wanted to be honest and see if I would be okay with it)?
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