Antonyms for the phrase "be grossed out by" could include the adjectives interested, fascinated, intrigued, awed, or amazed. If someone is interested in something, they are curious and eager to learn more about it, rather than disgusted or repelled by it. Similarly, if someone is fascinated or intrigued by something, they are captivated and engrossed by it, rather than grossed out or turned off. If someone is awed or amazed by something, they are filled with wonder and astonishment, rather than revulsion or dislike. Overall, there are many different ways to feel about something that don't involve being grossed out by it.