Extension of an averaged character quality of a group to an individual within a group (without evidence which would suggest it even in absence of group membership) is always wrong (at least if you happen to value accurate judgments and "just" outcomes). I think that many social psychological studies, which are conducted with the intention of remedying problems and understanding differences between groups so that we may structure our society more efficiently, are often ripped from their context and isolated from their intention and either A: Misinterpreted by a member of that group in a way that either offends them or saddens them or B: Used by an out-group member to justify snap judgments they've made about individuals within a group -- saving them the time and effort which is exacted by any degree of deliberate thought. There are several studies which suggest (and I don't necessarily agree with them, I'm merely addressing their existence), for example, that there are fewer women with exceptional talent in mathematics and the sciences. Does this serve as any justification for a judgment as to any one woman's talent in the area of maths and sciences? No, it does not. It is merely a study conducted to determine whether or not a disparity in representation in those fields between male and female gendered persons is due to a systematic error or simply a natural outcome of biological circumstances. It does not mean that, if I am to look at two applications to an internship in a research laboratory which are almost identical, I should accept the male gendered person simply because there may be greater overall talent in his social group, as this individual female applicant could very well be more talented than the male applicant.
If a study suggests that transgender people are, as a whole, somewhat more dishonest, it has no bearing on who you are as a person. Your honesty as an individual is different from the averaged honesty of a group which you may happen to belong to, and you should judge the honesty of other members in that group as you would judge the honesty of any person -- in accordance with evidence. This study may have been conducted, perhaps, for the purpose of determining whether the transgender person's dishonesty is a natural result of social pressures which are unique to them. It's not a condemnation, and social scientists, by and large, want to make the world a better place -- not a worse one.
