Meeting with Mr. Lamb became a turning point for Derry as he encouraged him to be friends with everyone and not to be bothered by their comments. Additionally, Mr. Lamb taught Derry to look at everything positively and admire everything around him. All of these factors combined had a significant impact on Derry's life.

1. Encouraging Derry to be friends with everyone:
Mr. Lamb's advice to Derry was to be friends with everyone, regardless of their background or differences. This had a profound effect on Derry as he had been struggling with a sense of isolation and loneliness. By encouraging him to be open and friendly towards others, Mr. Lamb helped Derry break down the barriers he had built around himself and start forming meaningful connections with his peers.

2. Not being bothered by comments:
Prior to meeting Mr. Lamb, Derry had been a target of negative comments and bullying from his classmates. Mr. Lamb's guidance helped Derry develop a thicker skin and not let these comments affect him. By teaching him to rise above the negativity and focus on building positive relationships, Mr. Lamb empowered Derry to overcome the negative impact of these comments and stand up for himself.

3. Looking at everything positively:
Mr. Lamb instilled in Derry a positive mindset, encouraging him to see the good in everything and everyone. This shift in perspective helped Derry appreciate the beauty and joy in life, even in the face of challenges. By adopting this positive outlook, Derry was able to find happiness and contentment, which significantly transformed his overall well-being.

4. Admiring everything:
Another important lesson that Derry learned from Mr. Lamb was to admire everything around him. This taught Derry to appreciate the small things in life, such as nature, art, and people's achievements. By developing this sense of admiration, Derry began to see the world in a different light and found inspiration and motivation in the people and things he encountered.

In conclusion, the meeting with Mr. Lamb became a turning point for Derry because he not only encouraged him to be friends with everyone and not be bothered by their comments but also taught him to look at everything positively and admire everything. These lessons had a profound impact on Derry's life, helping him overcome his challenges, build meaningful relationships, and develop a positive outlook on life.