Is it wise to consider all negative entities as simply your own negative thoughts?

[anagogy]

In that way might you treat even the most negative of entities in the same way you treat your own thoughts - that is, loving and accepting it? Embracing even that which would do you severe harm? Raising all your defenses and welcoming it as a part of you?

Since they only have beingness in your reality due to our vibrational activations of them, it is most wise indeed to consider negative beings thoughts. Properly, that is more of an indigo ray understanding. Remembering it, while in the yellow ray physical plane can be quite....challenging.

It is easy to meditate when outer conditions are peaceful, but have you ever tried it when someone slaps you in the face?

The physical world is good at shaking your attention away from the illusion generator and back to the illusion itself, but I commend you for the insightful realization. The spiritual human attention span is quite short, and easily distracted, but there is nothing saying we can't work to improve that (which is the work of the adept).