Yes, please DO convey the Gospel message.
‘Jesus died for your sins, and your homosexual BEHAVIOR is a sin. Accept Him as Lord and Savior, Go and sin no more, and please do not ask me again to PARTICIPATE in legitimizing your sinful behavior, because I cannot.’
NOTHING in that is hateful. It IS hateful to coddle a sinner, “It’s ok, I understand, it’s a big nasty world, but God loves you, it’s ok.”
I have to tell you that the old saying, “You catch more flies with honey than with vinegar” applies to spreading the Gospel, in my view. I would approach it differently: “I am a person of faith, and my faith teaches that certain behaviors are sinful. I am a sinner, as we all are. I believe that God sent His Son Jesus to suffer and die as payment for our sins, if we will accept Him and turn from our sin, as he taught us. I’d like to share with you more about my faith...”
That’s just me. We are all different.