Dexter appeared as a member of a Tourette’s support group in the film.
Sharon told BBC North West Tonight there had been a “positive reaction” after the release of I Swear, which won three Baftas in total.
However, she said since Sunday, it had gone back to being more negative comments being made and she felt it had overshadowed the success of the film.
“Some of the comments were really extreme,” she said, including “that people with Tourette’s shouldn’t be allowed out in public”.
“In the past few days, it’s got a bit back to more negativity rather than the positivity of winning the Baftas.
“This has overtaken the goodness out of it.”