No stigma at all, I've done solo trips of two and three weeks a few times now, I was weary the first time but have no problems at all now. I like the freedom of it, not worrying what others may or may not want to do is a really luxury at times, don't get me wrong I love going with family and friends but solo trips allow for me to indulge in the things I like to do at a pace I want to do it, I've also made many friends along the way too.