We are all, even the sexist, racist, homophobic and those with religious biases entitled to our feelings. What is crucial is how we behave toward others, even those we feel are 'scumbags'. Wherever our feelings fall on the spectrum of dislike to 'hatred' they do not entitle us to rage publicly, keeping in mind there is a difference between fact based criticism and just plain hate speech, and the criticism should be specific to other person's behavior not dragging in prejudicial statements about whatever demographic group(s) they belong to. Nor does it excuse discrimination in banking, housing, employment.
IMO, what our feelings do entitle us to is to disengage as much as the circumstances of our knowing them allows. We are not obligated to interact socially with people we have negative feelings about whether it's a gut instinct about someone we've just met or a family member we feel is toxic. I feel we should strive to be civil, tho some make that difficult, and being human i have not always suceeded in doing so.
Online, i tend to reserve judgement a little longer, because the medium is a factor and there is less risk to me if they are as 'bad' as i think/feel. In person i've learned to trust my instincts.