Welcome to HCM
It is your subjective feeling. Tonsils are well supported by the tissues around it. It is not possible tear it by making sucking motion in the throat.
Due to sucking motion you might have injured parts in your mouth and pharynx which is responsible for the slight bleeding.
I advice you to use the over the counter pharyngeal demulcents which will sooth the throat and reduce your symptoms.
If the pain increases i advice you to see ENT specialist
Hope i have provided the information you needed.