Judging the Gravity of a Sin by Un-Islamic Standards

Many of us Muslims tend to judge the gravity of sin by un-Islamic standards.

For example, if a person got "exposed" for committing a minor sin (e.g., flirting with non-mahram women), we would take this much more seriously than a person who openly and blatantly commits what is considered a major sin (e.g., unjustified dealing in riba transactions, etc.).

We blast the former harder than the latter at times (not all the time, but at times), and this is very wrong, for not only is the former sin less severe than the latter's, but the former also had the decency to try to keep it a secret.

I feel we need to reorient the way we look at these matters. It could be the case that we are becoming desensitized to the heinousness of some of the openly committed major sins simply because we got used to their manifestation, and I think that is extremely worrying.