Geneaolgy for Poor People

Well I haven't really touched my genealogy research for months. I have been so busy. I finally picked it back up because Footnote.com is having a special thing where the whole month of August 1930 Census records are free. This lead me to finding out that who I though was my ggrandfather, totally wasn't. The rootsweb info I collected just wasn't right. I assumed because of the birthdate which I only had the month and the year, and the state of birth. I just assumed this man was my ggrandfather. Big misteak I guess. I got on my ancestry.com tree and had to erase atleast 30 names or more associated with him. Then I noticed I had some messages from all the way back in May. This lady who happened to be his "real family" was cussing me out. "How dare you use my family name in your tree, you are not our family, you can't just take names". She even went as far as telling me I owe her thousands of dollars for the research she has done, traveled to find and paid for. I removed him off my tree, I wrote her back and said sorry I don't have the money at all times to view the proper records, does that mean that poor people shouldn't be able to try and research their genealogy. Everything costs money these days even your own dam history. So sometimes I just trust what I find and wait till I get a chance to prove or disprove it. Is that wrong? I didn't know my page was public, she could of let me know my info was wrong and why, not had to be so rude.