Unfortunately yes, there are lots of dudes on here who are rather obsessed with shaming plus size women. So I see how it could be tiresome to distinguish providers describing their own bodies and reviewers who have affirming things to say from those who are being mean and hateful.
To address the OP's question, here are a couple of Eccie search hacks:
After entering "BBW" in the Keyword(s) field, opt for "Search Titles Only" as that will bring up providers' ad titles or reviewers' review titles that explicitly include the term BBW. Or even better, limit the search options to one specific subforum such as Provider Ads in Dallas or X city.
Example:
"BBW" in "Provider Ads - Dallas"
Happy searching!