Further, you need to know that these websites (including Trulia and Zillow) earn money by charging realtors to advertise on their websites. Realtors pay monthly advertising fees to Trulia, Zillow and other websites. Realtors hope that consumers (buyers, sellers and renters) will call or contact them for assistance with finding a home. Since realtors are independent contractors, they need people to call them as "leads". Once you are on the phone or send an email or text, it is the realtor's job to assist you or ignore you - not Trulia's. Most realtors will ask questions and screen the potential leads to figure out if it's worth pursuing and assisting this person. If the realtor feels the person contacting them is not worth it, the realtor will end it or transfer them to somebody else. If the realtor feels it's worth pursuing, then a relationship will form. Although realtors are prohibited by Fair Housing laws to discriminate, it is LEGAL for realtors to CHOOSE who they want to work with because they are independent contractors. As long as the realtor is consistent and applies their decision to everybody - it is NOT discrimination.
Example: if I choose not to work with seniors, then I can discriminate against all seniors. However, I cannot pick and choose which seniors to work with - that is discrimination. If I choose not to work with renters, then I cannot work with all renters. I cannot pick and choose which renters to work with.
From what you stated, I don't think you have a case.