Investment should be judged by it characteristics and not your success or failure story.
Dont expect someone successful through real estate to talk badly about real estate. Surely, real estate investment has proven to be a good investment to them based on their achievement, so it is okay if you see them in an argument about which investment is the best. Among all the assets worth investing in, we have successful people earning from them. There is success in Gold, Real estate, Bitcoin- name them. People are using them to make money.
They don't have to speak badly about it, the truth is one don't have to downcast another to make one feel highly.
There are always going to be various good investment and the success rate will vary depending on individuals, it is like I should expect someone to downcast their source of success but they should be plain as possible in speaking especially the risks which many having interest in are often lacking.