They that sow the wind, shall reap the whirlwind
My experience is that the user experience on this site, more than on others, depends on how a user approaches it. Overwhelmingly, users that actively participate in the site, at least while their question is active, are treated kindly and with respect, provided they do the same. Indignant responses or refusal to work with the Q&A framework are good ways to have a question closed and downvoted and to be treated curtly in return. Many first-timers post their question and never return to the site and those questions are handled quickly and curtly.
By contrast, many users here are welcoming of first-time posters with legitimate questions, even if those questions are off-topic. When a question is unclear or not appropriate for our site, the OP usually has those guidelines explained in comments. We look into ways of recovering the core question if possible or point him to other resources (chat, the web, colleagues or managers) if that's not an option.
I personally try to make an effort to assume good faith and help people out when I can. There is nothing more rewarding than being able to relieve someone's anxiety or uncertainty and legitimately help someone's professional growth. In the 20 months that I've been here I've reached the Top 20 reputation list but all those internet points are meaningless compared to the rewarding feeling of having someone commenting with a heart-felt thank you and the knowledge that you made a difference. There aren't many sites where that is possible (the Parenting SE is probably similar). I'd wager that most of our active users take the same stance and while some can be direct or concise, I haven't seen any evidence of a trend of hostile behaviour towards new users. We have had a few instances of questions being mistreated in the past, but those are typically discussed on meta and resolved quickly.
So in short, The Workplace is perfectly kind and welcoming to users that approach the site in good faith.
It's interesting that I knew which post prompted you to ask this question when I read the title. With regards to that specific example, the user in question has provided valuable answers here in the past, as shown by his reputation history. He often answers very directly and concisely and sometimes speaks to hard truths. While that can come across as unwelcoming or unfriendly and while I disagree with his advice and tone on that particular answer, it doesn't indicate a trend or problem to me. You are free to downvote answers that you don't find useful.