Hanlon’s razor asserts that we should not attribute to malice what can be adequately explained by incompetence or other means.
Most conspiracy theories are implausible, and turn out not to be an effective cover-up by an elaborate network of mustache-twirling psychopaths bent on world domination. Most people who cut in line or are rude and offensive are not malicious and singling you out. Neglect, self-absorption, and misunderstanding are more likely culprits.
Of course malevolent and cruel people exist, but Hanlon’s razor reminds us not to take things personally. It’s almost never personal anyways.