Avoid the adverb ("sarcastically") even if it costs you more words. Even if it costs you a paragraph.
A huge mistake of beginning writers is that they think they need to compress their writing, and adverbs help them do that. What they fail to understand is that readers of fiction do not mind reading. You don't have to get your point across quickly or in the minimum number of words!
The job of the fiction writer is to guide the imagination of the reader, in the visual, auditory, sensory and emotional realms, so the reader sees, hears and feels what the writer is imagining for the characters.
You do need to pick out the highlights that matter, but describe those. If Andrew's tone of voice is "sarcastic",
David was dismissive. "That's just stupid."
Andrew mustered all the sarcasm he could. "I'm glad to know what you think of my politics, David! That's very insightful input."
Don't worry about word counts. Avoid the adverbs if you can. Guide the reader's imagination, that is the point.
You should have a movie going on your head, but you don't have the film maker's camera for the imagery, or music to clue us into the emotions, or the voices to convey the tones of voice. You must use words to convey all of the critical details to the reader.
The readers are not in a hurry to finish your story; but they will put it down if you fail to guide their imagination.
This is why we warn against "talking heads", and adverbs: They fail to prompt the imagination.
I'd also suggest that when tone of voice is important, it precede the speech (so it will be read in the correct tone), not follow it.