Sarcasm doesn't read well online

I made the mistake of telling my friend about my blog. Mostly this blog is written for the amusement of my single friends who live far away. But I told the 25 year old about the blog. I thought he might find it amusing. Today I received an email that said he read it and I didn't write nice things about him. Well, I won't make the mistake of telling another guy about the blog. I thought since he just wanted to be friends that he might be amused by some of my thoughts. I warned him that it was mostly girly gossip.