You know who you are. Nice try.
"Trust is inherently superior to Loyalty."
No more than humility is superior to honesty. The point here is that the statement is a false, needless, dichotomy.
"...Loyalty is inherently one-sided, Person A being willing to do anything asked of them by Person B, and stating that they believe a mutual "Loyalty" is basically... "Trust"."
When you pit the two against each other in this unidimensional analysis (that is, only examining the concepts as they are applied to the interpersonal domain), it does appear that trust could be loosely construed as superior to loyalty. But something that I think bears mentioning is the fact that loyalty does not only apply to persons, but also to values and ideas. You can be loyal to the value of compassion towards others, you can be loyal to the ideas embodied by the U.S. Constitution. You wouldn't necessarily say that you trust in the value of compassion towards others, or that you trust the ideas embodied by the U.S. Constitution. In this manner, loyalty has a wider scope as it can be applied to more things. This is the basis for personal integrity. As such, I'd be wary of anyone that discredits the notion of loyalty.
The assertion that loyalty is inherently one-sided I do agree with. By definition, loyalty is an attachment to someone or something, even if maintaining the attachment comes at great personal cost. This isn't a bad thing at all, as loyalty is integral towards forming identity: the reason why you are loyal to a value, idea, country, or person is because you identify strongly with whatever it or they stand for. So it is inherently one-sided because it's part of establishing identity of the practitioner of loyalty.
However, it isn't unusual in the interpersonal domain for two or more people to be mutually loyal towards each other. The functional outcome is something that can be labeled as a mutual trust, sure, but it should be recognized that trust can also be one-sided as well. So again...I don't see the point of asserting one is superior to the other when it comes to interpersonal relationships.
Some guidance, moving forward? Keep in mind that loyalties to values and ideas precede loyalty to people; you are loyal to individuals because they are representative of your own self-determined values and ideals. If these abstractions are precious to you, hold onto the people in your life that best embody them. People are subject to change over time, so if they come to no longer embody the ideals and values that you cherish or you yourself change up your beliefs, this is acceptable grounds to sever ties with them. You are not obligated to go down with their ship. It is not atypical for people to outgrow people; it happens.
And as an old supervisor of mine was fond of saying, “When someone wants you to do right, they appeal to your integrity. When they want you to do wrong, they'll question your loyalty.”. I always thought these were wise words to live by.
[end transmission]