To be clear, I cannot see that there is any discussion to be had about something that is held to be immune from criticism. The converse of this is, then, that anything that *is* offered up for discussion can be criticised. So, anyone who shares their personal experiences ought to expect sceptics to comment on them -- certainly in general terms.
The corollary of this is that if *you* are wanting to promote a discussion, then you can't tell people who disagree with you that they don't know what they are talking about. If you are (and you have) then you aren't promoting a discussion at all.
The criticism I have is not about tarring anyone with the brush of "delusion", either. It's merely a general observation that humans are not always reliable witnesses, and, as a result, objective evidence is needed before taking these claims seriously. With such evidence lacking, and with other (more plausible) explanations out there, then the most reasonable stance is that personal experiences related to the afterlife are interesting, but not compelling.